Wide-field photothermal reflectance spectroscopy for single nanoparticle absorption spectrum analysis
Author:
Kim Jung-Dae1ORCID, Kim Dong Uk1, Jeong Chan Bae1, Han Ilkyu1, Bae Ji Yong1ORCID, Hur Hwan1, Nam Ki-Hwan1, Hyun Sangwon1, Kim I Jong1ORCID, Lee Kye-Sung1, Chang Ki Soo1
Affiliation:
1. Center for Scientific Instrumentation, Korea Basic Science Institute , 169-148 Gwahak-ro, Yuseong-gu , Daejeon , 34133 , Republic of Korea
Abstract
Abstract
Photothermal imaging is useful for detecting individual nanoparticles and obtaining the absorption spectra. This study presents a wide-field photothermal reflectance spectroscopy technique achieved by incorporating a pump beam, a probe beam, and a charge-coupled device (CCD) camera into a commercial microscopic setup. The presented design does not require precise alignment between the pump and the probe beams and enables the observation of numerous individual nanoparticles during image acquisition. Despite the use of a simple imaging processing method, i.e., a four-bucket method using a CCD camera, sufficient sensitivity for the spectral imaging of a single gold nanorod (20 nm diameter and 84 nm length) is demonstrated. Numerous individual nanoparticles within a wide field of view (240 μm × 180 μm) are detected in an image captures at an imaging measurement speed of 0.02 mm2 min−1. Furthermore, the proposed photothermal reflectance spectroscopy technique can detect the variation in the absorption peak of the measured spectra depending on the aspect ratio of individual nanoparticles within a spectral resolution of 1 nm.
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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